Device for joining insulating wire terminals of electrical conductors



c. H. JAsFER 1,933,555

DEVICE FOR JOINING- INSULATING- WIRE TERMINALS OF ELECTRICAL CONDUGTORSNov. 7, 1933.

Original Filed June 25. 1921 ES/ve?" Patented Nov. 7, 1933 DEVICE FOB. JDINING INSULATING WIRE TERMINALS OF ELECTRICAL CON- DUCTORS ChristiaanHendrik Jasper, Rotterdam, Netherlands, assignor to NaamloozeVennootschap Electriciteits Maatschappij Electrostoom, Rotterdam,Netherlands, a, company of the Netherlands original application June 23,1921, Serial' No. 479,949, and in the Netherlands .lune 5, 1920. Dividedand this application January 31, 1929.

Serial No. 336,480

5 Claims. (Cl. 173-263) Application iiled in the Netherlands June 5,1920, No. 15,024 Ned.

The invention relates to a process and to means for joining electricalconductors, particularly at their ends, and is illustrated, by way ofexample, in the accompanying drawing, in which:-

"Fig, l is a longitudinal sectional View of a joint constructedaccording to the invention.

Fig. 2 shows the helically Wound Wire sleeve in elevation and on anenlarged scale.

Fig. 2a is a view similar to Fig. 2 showing a, modiiied form ci Wiresleeve.

liig. 3 is a view similar to Fig. l showing a helical wire sleeve oftriangular cross-section.

This application is a division of my application Serial Number 479,949,led .lune 23, 1921, issued February 5, 1929, as Patent No. 1,700,985.

In carrying out my invention the bared ends of conductors are twistedtogether into a terminal 1 of uniform cross-section to which solder maybe applied if desired.

According to the form of the'invention illustrated in Figs. l and 3, ahelical Wound wire sleeve 2 is inserted in a cap 5 of hard rubber or ofIany other suitable insulatingV material, said cap having its open endportion formed with a conical interior surface. The ends 3 and 4 oi thewire sleeve 2 may be cent over upon the sleeve to extend parallel to itsaxis, as illustrated in Figure 2, or may extend at right angles to theaxis of the sleeve, as illustrated in Figure 2a. ln either case, whenthe sleeve is inserted in said cap, the ends 3 and 4 slide in a groove'7 as illustrated in Figs. l and 3, or in grooves, arranged oppositeeach other in the insulating cap 5, if the ends of the wire sleeveextend on both sides of the wire sleeve, as illustrated in Fig. 2a. Theends 3 and 4 of the sleeve cooperate with the walls of said groove orgrooves to prevent the sleeve from turning in the cap. The cap with thewire sleeve inserted therein, is now screwed on to the twisted terminal1 in the same manner as a nut is screwed on to the threaded end of abolt. The metal of which the wire sleeve is made should be harder thanthat of the conductor'wires so as to enable the wire sleeve to cut athread in the twisted terminal 1 when the cap is screwed thereon. Itwill "ne evident, that for this purpose, the individual turns of thewire sleeve form screw threads.

the insulation 8 and the conical surface, thisV ring heing also conicalto t the conical surface oi the cap. lf before screwing the cap on theterminal, liquid shellac is poured into it, the

shellac will be forced into the interstices of the metal parts and, uponhardening, will cooperate with the rubber ring 6 and insulation 8 toform an air tight and waterproof joint and will also prevent corrosionof the metal.

When dealing with conductors of large crosssection, the wire of whichthe sleeve 2' is made may have a triangular cross-section, as indicatedin Figure 3,' so that the inwardly directed edges of the wire iormcutting threads for cutting threads in the terminal l as the cap isscrewed thereon.

l claim:

l. An insulating cap for covering the ends of electrical conductors,comprising an outer rigid sleeve of insulating material, and a metalsleeve tted into the bore of said outer sleeve, said metal sleeve beingformed of a helically coiled wire, said outer sleeve constituting aholding device which holds the coiled wire against expansion, the wireforming threads upon said conductors when connecting them together.

2. An insulating cap for covering the ends of electrical conductors,comprising an outer rigid sleeve of insulating material and a metalsleeve iltted into the bore of said outer sleeve, said metal sleevebeing formed of a. helically coiled wire of triangular Vcross section.

3. An insulating cap for covering the ends of electrical conductorscomprising an outer rigid sleeve of insulating material with a coiledmetal wire on the interior thereof, said outer sleeve constituting aholding device which holds the coiled wire against expansion, the coiledwire forming threads upon said conductors and connecting them together.

4. An insulating cap for covering the ends of electrical conductorscomprising an outer rigid sleeve of insulating material closed at oneend with a coiled wire located therein and tightly tting the bore o! thesleeve, said outer sleeve constituting a holding device which holds thecoiled wire against expansion, the coiled wire forming threads upon saidconductors` and con- 5 necting them together.

5. A joining and insulating electrical connection comprising a pluralityof conductor ends, a. rigid joining and insulating device provided with

